Method of making bolts.



1,244,125. r Patented M23, 1917.

LE GRAND PARISH.

METHOD OF MAKING B0 APPLICATION FIEED JUNE 30, 19!

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1 LE. GRAND PARISH, or MOUNTAI'NVIEW, NEW JERSEY.

METHOD OF-YMAIKING BOLTS.

1,244,125. Original application filed March 2,1912,

To all whomit may concern:

Be it known that I, LE GRAND PARISH, a citizen of th United States,residing in Mountainview, in the county of Passaic and State of New Jersey, have invented certain new and useful'lmprovements in Methods .ofMaking Bolts, of which the following is a specification.

This invention, which is a division of my co-pending application, SerialNumber 681,259, filed March 2 1912, relates to methods of making boltsand has'for one of its primary objects the provision of an improvedmethod whereby bolts can be expeditiously and economically made, with aminimum amount of metal, and with the metal disposed in such manner asto secure greatly increased strength at the points wheremost needed.

I accomplish the foregoing by means of a method which I havediagrammatically the head to be made.

the accompanying drawings,

reference to Figs. 3 and 4 that the bolts I have the usual shank portion7 and a head 8, which may be of the square type as shown, or of anyother desired form, but which has a pyramidal recess 9 formed in theface thereof corresponding in configuration to the head Stated 1n otherwords,

for square headed bolts the recess will be substantially squarepyramidal.

In makingthe bolts I pursue the following method: The bolts are madefrom bar stock 10, which is preferably fed forward step by step by anydesired form of mechanism, and which issuitably supported at the workend by 'means of the two-part stationary die 11 whichis provided with are-. cess 12 inits face of the conformation of Arranged in alinementwith said recess and bar 10, is a movable die 13 provided with aprojection 14 of a I configuration correspondmg to the shape of theusual practice.

Specification of Letters Patent. I Patented Oct. 23, 1917.

Serial No. 681,259. Divided and this application filed June 30, 1917.Serial No. 177,932.

the head to be formed, and adapted to form the recess 9 in the head ofthe bolt. Assuming that the parts are in the position indicated in Fig.1, the die 13 is advanced and compresses the end of the bar 10,upsetting the head 8 and simultaneously forming the recess 9 therein.The bolt is then cut off with the desired length of shank.

' It will be noted that the bolt thus formed is of the same generalformation as the usual bolt but requires less metal for the same sizes,and this eifects' a great saving when the bolts are made in quantitiesas is At the same time a maximum strength is secured for the metalforming the head is compressed by the die 13 and the projection 14 whenthe head is. being upset and the recess formed.

It will be noted that the projection 14, because of its frusto-pyramidalshape, leaves a much thicker portion of metal in the head adjacent thepoint of juncture between the head and the shank, and such portions ofthe metal, which I have indicated bythe letter a, will' be far 'more'densely compressed, thus affording greater initial shear resistance,more than compensating for the possible reduction in shear strengthoccasioned by the decrease in the actual volume of metal forming thehead. By reason of its wedge like shape therefore J the projection '14secures proper distribution and greater density of the metal, giv-- ingthe head of the bolt a shear strength greater than that of the shank,and sufiiciently great for all ordinary purposes.- Each of the sidewalls of the heacl,a's indicated at b, c and d, buttresses orsupportsthe adjacent walls.

I claim 1. The herein-described process of forgingbolts from bar stockwhich consists in upsetting the head and forming a recess havingconverging walls in the face of thehead by the same operation, the depthof the recess being less than the depth of the head. q

2. The herein-described process of forging bolts from bar stock whichconsists-in upsetting a head of greater. dimension than the shank and insimultaneously forming a recess inthe face of the head of substantiallythe same configuration as the head, the depth of the recess being lessthan the depth of the head.

3. The herein-described process of forg- 5 ing bolts from bar stockwhich consists in upsetting a head of greater dimension than the shankand in forming a recess in the face of the head having converging walls,

less than the diameter of the'shank. In testimony whereof I havehereunto signed my name.

LE GRAND PARISH.

